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Q.

A ray reflected successively from two plane mirrors inclined at a certain angle undergoes a deviation of 3000. The number of observable images is

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a

11

b

60

c

12

d

5

answer is C.

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Detailed Solution

If the angle between the mirrors are at an angle θ

Deviation=360°-2θ

360°-2θ=330o⇒θ=30o

No. of images formed is 

n=360°θ-1

n=360°30o-1

n=11

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